导热填料对LLDPE性能的影响

Effects of Thermal Conducting Fillers on Properties of LLDPE

选取铝粉(Al)、碳化硅(Si C)、氮化铝(Al N)、氧化镁(Mg O)、石墨(C)和线型低密度聚乙烯(LLDPE),通过注塑成型制备了导热复合材料。研究了导热填料用量对复合材料热导率和力学性能的影响。结果表明:随着导热填料用量的增加,复合材料的热导率明显提高;导热填料用量为9%时,LLDPE/Al和LLDPE/C的导热性能最佳;复合材料的断裂伸长率随着填料用量的增加而下降,石墨(C)加入后基体的拉伸强度上升,其他填料加入后拉伸强度随着填料用量的增加而下降。实验数据表明,复合材料的热导率上升趋势与理论模型的预测趋势一致。

A thermally conductive composite plastics was obtained from a particles mixture of aluminum（Al）, silicon carbide（Si C）, aluminum nitride（Al N）, magnesium oxide（Mg O）, graphite（C） and linear low-density polyethylene（LLDPE） by injection molding. The effects of the thermal conductivity of filler loading for thermal conductivity and mechanical properties of the composites were investigated. The results show that with a higher proportion of the thermally conductive filler, the thermal conductivity of the material increases. When the thermally conductive filler content is 9%, the thermal conductivity of LLDPE/Al and LLDPE/C is optimal. The elongation of break of the composite material decreases with the increasing of filler loading; and the tensile strength of the matrix increases after adding the graphite, but decreases after adding other fillers. The experimental data show that the rising trend for thermal conductivity of the composite is consistent with the theoretical model.